By Ulrich Wittrock
This ebook treats the improvement and alertness of adaptive optics for and drugs. The contributions describe lately built elements for adaptive-optics structures comparable to deformable mirrors, wavefront sensors, and reflect drivers in addition to entire adaptive optical structures and their functions in and medication. purposes diversity from laser-beam forming and adaptive aberration correction for high-power lasers to retinal imaging in ophthalmology. The contributions are in line with shows made on the 4th foreign Workshop on Adaptive Optics in and drugs which happened in M?nster, Germany, in October 2003. This hugely winning sequence of workshops on adaptive optics began in 1997 and keeps with the fifth workshop in Beijing in 2005.
Read or Download Adaptive Optics for Industry and Medicine : Proceedings of the 4th International WorkshopMünster, Germany, Oct. 19-24, 2003 (Springer Proceedings in Physics) (Springer Proceedings in Physics) PDF
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Additional info for Adaptive Optics for Industry and Medicine : Proceedings of the 4th International WorkshopMünster, Germany, Oct. 19-24, 2003 (Springer Proceedings in Physics) (Springer Proceedings in Physics)
4 . In a BD-system spherical aberration occurs once because of mass-production limited waviness of the surfaces of the disks. A nominal waviness of ±2 µm on the surface requires an active correction [3, 4]. The second source for spherical aberration in a BD-system results from the optical path diﬀerences of the axial and periphery rays when switching between the data layers. The BD-type disk uses two data layers with cover layer thicknesses of typically 80 µm and 100 µm, respectively and by focusing through the ﬁrst semi-transparent data layer onto the second fully reﬂective data layer light passes trough a spacing layer of around 20 µm consisting of polycarbonate.
Photographs of the back of the mirror, showing the ﬂexures and electrode pattern, and the fully assembled mirror Fig. 3. 2 Performance A laser vibrometer (see Fig. 3 for schematic) was used to determine the resonant frequency and maximum stroke of the assembled device. 1. From the table it can be seen that the measured resonant frequency is close to that predicted. The stroke achieved is only 60% of that predicted, but the model does not include the glue layer between the mirror substrate and PZT elements.
Somalingam et al. Fig. 7. Phase proﬁle of coma aberration Fig. 8. Electrode design of the LC device to compensate coma aberration Fig. 9. Visualized phase shift under two crossed polarizes and the measured phase proﬁle using a Shack–Hartmann sensor using an appropriate large sub domain, which is provided with a medial voltage. 9a visualizes the diﬀerent phase shifts under two crossed polarizers when illuminated with white light. 9b shows a preliminary measurement of the wavefront when LC device was switched on.
Adaptive Optics for Industry and Medicine : Proceedings of the 4th International WorkshopMünster, Germany, Oct. 19-24, 2003 (Springer Proceedings in Physics) (Springer Proceedings in Physics) by Ulrich Wittrock